| 摘要 |
PURPOSE:To prevent surely the malfunction of a camera just after power-on by holding the output of a drive circuit, which is controlled by a microcomputer, constant with a signal generated from a strobe circuit having a prescribed constitution. CONSTITUTION:When a power switch is turned on, a high-level strobe signal is generated quickly by a strobe circuit 23 consisting of a capacitor C1 and a resistance R1 connected in series and a diode D1 of a constant voltage element connected in parallel to them in a power supply circuit. A transistor TR Tr2 of a drive circuit 6 is turned on by this signal, and a TR Tr1 is turned off independently of the output of a microcomputer 3, and the output of the circuit 6 is kept constant. Consequently, the malfunction based on operation unstableness of the microcomputer just after power-on is prevented surely. |
